The efficacy of oral STI571 in participants with systemic sclerosis is defined by an improvement in MRSS. Skin thickness was assessed clinically in each of 17 body areas and scored using a 0-3 scale, where 0= normal, 1= mild thickness, 2= moderate thickness, and 3= severe thickness (maximum score 51). A higher score indicates greater severity of the disease.

Efficacy analysis set included all participants who received at least one dose of the study drug with at least one post-baseline measurement. Number analyzed are the number of participants with data available for analyses at given time point.

An AE is the appearance or worsening of any undesirable sign, symptom, or medical condition occurring after starting the study drug even if the event is not considered to be related to the study drug. An SAE is defined as an event that is fatal or life-threatening, results in persistent or significant disability/incapacity, constitutes a congenital anomaly/birth defect, requires inpatient hospitalization or prolongation of existing hospitalization, is medically significant, i.e., defined as an event that jeopardizes the patient or may require medical or surgical intervention to prevent one of the outcomes listed above.

Safety analysis set included all participants who received at least one dose of the study drug with at least one post-baseline measurement.

The following MRSS categories were calculated for up to Week 48: Non-response: a reduction in MRSS <25%, Partial response: a reduction in MRSS between 25-<50%, Complete response: a reduction in MRSS between 50-<80%, Remission: a reduction in MRSS ≥80%.

Efficacy analysis set included all participants that received at least one dose of the study drug with at least one post-baseline measurement. Number analyzed are the number of participants with data available for analyses at given time points.